From the Metric View, users can add any currently displayed widget to a custom dashboard. To add a widget to a custom dashboard, click the triple-dot button in the top right-hand corner of the widget and select 'Add to Custom Dashboard'
Select the Custom Dashboard(s) you would like to add the widget to, then click the 'Add Metric Widget' button.
Your widget will be added to the custom dashboard. New widgets are always added beneath the custom dashboard's existing widgets.